I have seen my Oscars sleep they sit on the bottom corner next to each other and just stay still its weird first i thought something was wrong but after seeing it a few times I came to the conclusion they were sleeping.
I woke up in the middle of the night one night, and saw my guppy upside down against the glass on the bottom of the tank!!!!! I didnt know what to do so I just got the net out to get him out and than I touched him and he swam away....scared the crap out of me! So therefor....he was sleeping
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